Sparking-coil casing.



BEST AVAKLABLE CO No. 704,589. Patented July I5, 1902. C. F. SPLITDURF.SPARKING COIL CASING. (Application filed Apr. 80, 1902.) (No Model.)

WITNESSES I arm A TTORNEY BEST AVAiLABLE COPE UNITED STATES PATENTOrrrcn.

CHARLES F. SPLI TDORF, OF NEW YORK, N. Y.

SPARKlNG-COIL CASING.

SPECIFICATION formingpart of Letters Patent No. 704,589, dated. July 15,1902.

Application filed April 30, 1902.

To all whom, it may concern/.-

Be it known that I, CHARLES F. SPLITDORF, a citizen of the UnitedStates, residing in the borough of Manhattan, in the city, county, andState of New York, have invented a. new and useful Improvement inSparking-Coil Casings, of which the following is a specification.

This invention relates to sparking-coils, and it has more particularlyfor its object to improve the casings employed with coils of the jump-spark type to render the same strong and durable, impervious: tomoisture, and having the quality of non-conductiveness to such an extentas to prevent leakage of the electric current therethrough.

To these ends my invention comprises in brief an outer cylindricalcasing composed of fiber or other infrangible substance possessing tosome extent the quality of resisting the passage of an electric current;a cylindrical multiply-roll of thin sheetrnbber, either hard or soft,distended within the outer casing to' serve eiiectually as anon-conductor; outer end disks, of fiber or the like, to close theeasing; inner thin multiply-disks of rubber, hard or soft, and hollow orcylindrical soft-rubber plugs uniting the disks and having projectingends to afford yielding entrances or exits for the terminal wires.

In the drawings accompanying this application, Figure 1 is a verticalsectional view of my improved sparking-coil casing. Fig. 2 is a top planview thereof, partly in horizontal section, on the line w a: of Fig. 1;and Fig. 3 is a detail plan or end view, on a reduced scale, of theinner casing employed.

The letter A indicates the outer 0: main cylindrical casing, the samebeing made of fiber or other material having the quality of toughnessand that is not liable to split or crack and, further, having to somedegree the quality of non-conductivity. \Vhile this outer casing neednot be a perfect insulator, because it is intended, primarily, as astrong and durable envelop, yet it must not be a conductor ofelectricity, like metal, and hcnceI prefer to employ fiber or likenmterial that is both strong and a fair insulator. Placed within casingA is a mnltiplyroll of rubber B, which may bevcithor of the hard or softvariety. I, however, prefer to employ hard rubber, because a thin sheetthereof rolled upon Serial No. 105,207. on model.)

itself and inserted within cylinder A will of its own tension expandtherein to lie snugly against the inner wall of the latter.

The reason for havingamultiply-roll of rubher is that in case of a crackoccurring in one ply or thickness the same would be covered by theremaining plies or thicknesses, and so prevent leakage. v

0 indicates the usual core, D the inner winding, and E the outer windingof the coil, these elements having the usual insulatingseparators c d.

The cylinder ends are capped with disks, as F F, of fiber or othersuitable material, the same being secured upon the cylinderA either byannular recesses or by other suitable means, and one or a plurality ofinsulatingdisks, as G G, of hard or soft rubber lie against the interiorsurfaces of said cap-disks F F. The spaces intermediate the disks (1 Gand the ends of the coil-windings are filiod with paraflin-wax or thelike (indicated at H) to prevent the entrance ofmoisture and to completethe insulation,

The disks F F and G G are pierced for the core C and also for theterminal wires of the winding, as seen. In these latter apertures areplaced bushings or plugs e e e e, of soft rubber, the same being shortlengths of tubing with a flange or head at the inner end which serves toprevent withdrawal through the apertures in disks F F G G, besides in ameasure uniting said disks. The opposite ends of the bushings or tubing6 e e e project exteriorly beyond the disks F F and are intended toserve as flexible guards for the terminal-wire coverings to preventabrasion thereof by rubbing against the edges of the apertures in thecaps F F, through which said Wires pass.

The aforesaid construction of sparking-coil casing is perfectlydamp-proof and combinesa positive insulation with exceptional strength.Certain modifications thereof may be made Without departing from thespirit of my invention and I therefore do not wish to be limited to theprecise construction herein shown and described; but

I desire to claim broadly and secure Letters Patent upon 1.Asparking-coil casing comprisingashell composed of tough non-conductingmaterial,

BEST AVAiLABLE CUP:

r of material relied upon itself in several plies,

and possessing t-he'qualityof non-conductivity to a higher degree, aoy1inder-eap,-an insnlating-disk at itsinn'er surface, and a body ofplastic insulation interposed between said disk and the coil-winding.

" 3. In a sparking-coil ageing having the usual terminal openings, aninsulating-bushing within eaoh ot said openings, each of said 15bushings having an inward retaining-flange and an outwardly-projectingflexible exten- 81011.

In testimony whereof I have signed my name to this specification, in thepresence of 20 two subscribing witnesses, this 16th day of April, 1902.

CHARLES EXPLITDORF.

Witnesses:

NAT. B. CHAnsnY, J11 NATHAN B. CHADSEY; 7

